Police said Frank James MacArthur, 47, emerged late Saturday evening after having remained inside his home in the 600 block of McKewin Street when officers sought to serve a warrant issued in June by his probation agent stemming from a 2009 gun case. Authorities said MacArthur had missed a court date.

With a tactical unit outside, MacArthur broadcast his talks with a police negotiator on The Baltimore Spectator website. He expressed frustration about his treatment by police, telling listeners, "I am surrounded by a bunch of men with guns."

Lt. Col. Garnell Green said the tactical unit was called in because MacArthur had recently issued threats against officers on Twitter.

During a search of the house, detectives said they found a sawed-off, 20-gauge shotgun and various types of ammunition inside a bedroom. Police are consulting with prosecutors regarding a felon possessing a gun after being convicted of a misdemeanor. Police said additional charges could stem from MacArthur's conviction in of a gun charge in December 2002. MacArthur was sentenced to a six-month suspended sentence and one year of probation.

An Iranian military observation aircraft flew within 50 yards of an armed U.S. Navy helicopter over the Persian Gulf this month, sparking concern that top Iranian commanders might not be in full control of local forces, CNN has learned.